Services performed on an aircraft by an organization other than that to which the aircraft is assigned, according to an established operational aircraft cross-servicing requirement, and for which there may be a charge. Aircraft cross-servicing has been divided into two categories: a. Stage A cross-servicing: The servicing of an aircraft on an airfield/ship which enables the aircraft to be flown to another airfield/ship. B. Stage B cross-servicing: The servicing of an aircraft on an airfield/ship which enables the aircraft to be flown on an operational mission.